U.S. patent number 10,338,721 [Application Number 15/722,837] was granted by the patent office on 2019-07-02 for display substrate and display panel.
This patent grant is currently assigned to Shanghai Tianma Micro-Electronics Co., Ltd.. The grantee listed for this patent is Shanghai Tianma Micro-Electronics Co., Ltd.. Invention is credited to Chuanli Leng, Liang Liu, Xingyao Zhou.
View All Diagrams
United States Patent |
10,338,721 |
Zhou , et al. |
July 2, 2019 |
Display substrate and display panel
Abstract
A display substrate comprises a display region and a non-display
region surrounding the display region and including at least one
display signal line, at least one pressure sensor with two pressure
signal output terminals, a first and a second pressure signal
output lines electrically connected to two pressure signal output
terminals of the corresponding pressure sensor. The first pressure
signal output line includes at least one first and at least one
second line sections, electrically connected by a first connecting
section. The second pressure signal output line includes at least
one third and at least one fourth line sections, electrically
connected by a second connecting section. All line sections are in
parallel to the display signal line. A first distance from the
first and third line sections to the display signal line is greater
than a second distance from the second and fourth line sections to
the display signal line.
Inventors: |
Zhou; Xingyao (Shanghai,
CN), Leng; Chuanli (Shanghai, CN), Liu;
Liang (Shanghai, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Shanghai Tianma Micro-Electronics Co., Ltd. |
Shanghai |
N/A |
CN |
|
|
Assignee: |
Shanghai Tianma Micro-Electronics
Co., Ltd. (Shanghai, CN)
|
Family
ID: |
59641279 |
Appl.
No.: |
15/722,837 |
Filed: |
October 2, 2017 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20180024686 A1 |
Jan 25, 2018 |
|
Foreign Application Priority Data
|
|
|
|
|
Jun 30, 2017 [CN] |
|
|
2017 1 0522562 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G06F
3/0414 (20130101); G06F 3/04142 (20190501); G06F
3/0416 (20130101); G06F 3/0412 (20130101); G02F
1/136286 (20130101); H01L 27/3265 (20130101); G02F
1/13338 (20130101); G09G 2310/0286 (20130101); H01L
27/3276 (20130101); G09G 3/3208 (20130101); G09G
3/36 (20130101); H01L 27/323 (20130101) |
Current International
Class: |
G06F
3/041 (20060101); G02F 1/1333 (20060101); G02F
1/1362 (20060101); G09G 3/3208 (20160101); G09G
3/36 (20060101); H01L 27/32 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Adediran; Abdul-Samad A
Attorney, Agent or Firm: Anova Law Group, PLLC
Claims
What is claimed is:
1. A display substrate, comprising a display region and a
non-display region surrounding the display region, wherein the
non-display region includes: at least one display signal line; at
least one pressure sensor configured with two pressure signal
output terminals; and a first pressure signal output line and a
second pressure signal output line that correspond to the at least
one pressure sensor, and are electrically connected to the two
pressure signal output terminals of the corresponding pressure
sensor, respectively, wherein: the first pressure signal output
line includes at least one first line section and at least one
second line section; the at least one first line section and the at
least one second line section are electrically connected by a first
connecting section; the second pressure signal output line includes
at least one third line section and at least one fourth line
section; the at least one third line section and the at least one
fourth line section are electrically connected by a second
connecting section; the at least one first line section, the at
least one second line section, the at least one third line section,
and the at least one fourth line section are configured in parallel
to the at least one display signal line; the at least one first
line section and the at least one third line section have a first
distance to the at least one display signal line; the at least one
second line section and the at least one fourth line section have a
second distance to the at least one display signal line; and the
first distance is greater than the second distance.
2. The display substrate according to claim 1, wherein: a total
length of all first line sections of the first pressure signal
output line is equal to a total length of all third line sections
of the second pressure signal output line; and a total length of
all second line sections of the first pressure signal output line
is equal to a total length of all fourth line sections of the
second pressure signal output line.
3. The display substrate according to claim 2, wherein: the first
pressure signal output line includes a first number of the at least
one first line sections and a first number of the at least one
second line section; the second pressure signal output line
includes a second number of the at least one third line sections
and a second number of the at least one fourth line sections; and
the first number is equal to the second number.
4. The display substrate according to claim 3, wherein: the at
least one first line sections, the at least one second line
sections, the at least one third line sections, and the at least
one fourth line section have an equal length.
5. The display substrate according to claim 2, wherein: the first
connecting section and the second connecting sections are paired
and crossed with each other, and arranged alternately.
6. The display substrate according to claim 5, wherein: the
non-display region further includes one or more of the first
connecting section, and one or more of the second connecting
section, a ratio of a total length of the one or more of the first
connecting sections over a length of the first pressure signal
output line is less than 1:10; and a ratio of a total length of the
one or more of the second connecting section over a length of the
second pressure signal output line is less than 1:10.
7. The display substrate according to claim 5, wherein: a section
length of an orthogonal projection of the first connecting section
on an extension direction of the at least one display signal line
is equal to a section length of an orthogonal projection of the
paired second connecting section on the extension direction of the
at least one display signal line.
8. The display substrate according to claim 1, wherein: the at
least one first line section and the at least one second line
section of the first pressure signal output line includes a
plurality of first line sections and a plurality of second line
sections, respectively; and the at least one third line section and
the at least one fourth line section of the second pressure signal
output line includes a plurality of third line sections and a
plurality of fourth line sections, respectively.
9. The display substrate according to claim 1, wherein: a driver
chip is configured in the non-display region; and the first
pressure signal output line and the second pressure signal output
line are electrically connected to the driver chip.
10. The display substrate according to claim 9, wherein: the at
least one pressure sensor is independently connected to a separate
first pressure signal output line and a separate second pressure
signal output line; or a pressure sensor of the at least one
pressor sensor that is far away from the driver chip shares a
portion of the first pressure signal output line with a pressure
sensor of the at least one pressor sensor that is close to the
driver chip, and the pressure sensor that is far away from the
driver chip shares a portion of the second pressure signal output
line with the pressure sensor that is close to the driver chip.
11. The display substrate according to claim 1, wherein: the at
least one display signal line includes at least one of a clock
signal line, an inverted clock signal line, and a trigger signal
line.
12. The display substrate according to claim 11, wherein: cascaded
shift registers are configured in the non-display region; the at
least one display signal line is electrically connected to the
cascaded shift registers; and the at least one pressure sensor is
configured between two adjacent shift registers.
13. The display substrate according to claim 1, wherein: the at
least one first line sections and the at least one second line
sections of the first pressure signal output line, the at least one
third line sections and the at least one fourth line sections of
the second pressure signal output line, and the at least one
display signal line are disposed in a first metal layer.
14. The display substrate according to claim 13, wherein: the first
connecting sections is disposed in the first metal layer; and the
second connecting sections includes at least a bridge portion in a
second metal layer.
15. The display substrate according to claim 13, further including
data lines, scanning lines, and pixel capacitors disposed in the
display region, wherein: the first metal layer includes the data
lines; or the first metal layer includes the scanning lines; or the
first metal layer includes first electrodes or second electrodes of
the pixel capacitors.
16. The display substrate according to claim 1, wherein: the at
least one pressure sensor is a bridge type pressure sensor or a
semiconductor pressure sensor.
17. The display substrate according to claim 16, wherein: the at
least one pressure sensor includes two bias voltage input
terminals; and a first bias voltage input line and a second bias
voltage input line corresponding to the at least one pressure
sensor are configured in the non-display region, and are
electrically connected to the two bias voltage input terminals of
the at least one pressure sensor.
18. A display panel, comprising a display substrate, wherein the
display substrate includes a display region and a non-display
region surrounding the display region, wherein the non-display
region includes: at least one display signal line; at least one
pressure sensor configured with two pressure signal output
terminals; and a first pressure signal output line and a second
pressure signal output line that correspond to the at least one
pressure sensor, and are electrically connected to the two pressure
signal output terminals of the corresponding pressure sensor,
respectively, wherein: the first pressure signal output line
includes at least one first line section and at least one second
line section; the at least one first line section and the at least
one second line section are electrically connected by a first
connecting section; the second pressure signal output line includes
at least one third line section and at least one fourth line
section; the at least one third line section and the at least one
fourth line section are electrically connected by a second
connecting section; the at least one first line section, the at
least one second line section, the at least one third line section,
and the at least one fourth line section are configured in parallel
to the at least one display signal line; the at least one first
line section and the at least one third line section have a first
distance to the at least one display signal line; the at least one
second line section and the at least one fourth line section have a
second distance to the at least one display signal line; and the
first distance is greater than the second distance.
19. The display panel according to claim 18, wherein the display
substrate is an array substrate.
20. The display panel according to claim 18, wherein the display
panel is a liquid crystal display panel or an organic light
emitting display panel.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims the priority of Chinese Patent Application
No. CN201710522562.6, filed on Jun. 30, 2017, the entire contents
of which are incorporated herein by reference.
FIELD OF THE DISCLOSURE
The present disclosure generally relates to the display technology
and, more particularly, relates to a display substrate and a
display panel.
BACKGROUND
Mobile terminal devices such as mobile phones and portable
computers, etc., and information inquiry devices installed in
public areas are often equipped with displays with touch function.
As the display technology advances, the touch function of displays
become more and more mature, gradually evolving from basic
touch-control functions to special touch-control functions such as
pressure sensitive touch-control function.
At present, the touch-control display devices often use at least
one pressure sensor to provide the pressure sensitive touch-control
function. The pressure sensor's capability of sensing the pressure
applied by fingers and styluses, etc., substantially expands the
application scenarios of the touch-control display devices. In the
existing technology, the pressure sensors are often configured in
non-display region of display panel, and the pressure sensor is
electrically connected by the pressure signal output lines in the
non-display region. The pressure sensing signals are sent to a
driver chip by the pressure signal output lines. Based on the
pressure sensing signals, the driver chip detects the pressure.
Each pressure sensor is often connected by two pressure signal
output lines. In addition, display signal lines are often
configured in the non-display region of the display substrate. The
display signal lines are also connected to the driver chip.
According to the present disclosure, coupling noises may exist
between the display signal lines and the two pressure signal output
lines of each pressure sensor. Each pressure signal output line is
coupled with different noise level. The pressure sensing signals
carried by the two pressure signal output lines are often affected
or corrupted, thus causing incorrect pressure measurement
calculated by the driver chip.
The disclosed display substrate and display panel are directed to
solve one or more problems set forth above and other problems.
BRIEF SUMMARY OF THE DISCLOSURE
One aspect of the present disclosure provides a display substrate,
comprising a display region and a non-display region surrounding
the display region. The non-display region includes at least one
display signal line, at least one pressure sensor configured with
two pressure signal output terminals, and a first pressure signal
output line and a second pressure signal output line that
correspond to each pressure sensor, and are electrically connected
to the two pressure signal output terminals of the corresponding
pressure sensor, respectively. The first pressure signal output
line includes at least one first line section and at least one
second line section. The first line section and the second line
section are electrically connected by a first connecting section.
The second pressure signal output line includes at least one third
line section and at least one fourth line section. The third line
section and the fourth line section are electrically connected by a
second connecting section. The first line section, the second line
section, the third line section, and the fourth line section are
configured in parallel to the display signal line. The first line
section and the third line section have a first distance to the
display signal line. The second line section and the fourth line
section have a second distance to the display signal line. The
first distance is greater than the second distance.
Another aspect of the present disclosure provides a display panel,
comprising a disclosed display substrate.
Other aspects of the present disclosure can be understood by those
skilled in the art in light of the description, the claims, and the
drawings of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The following drawings are merely examples for illustrative
purposes according to various disclosed embodiments and are not
intended to limit the scope of the present disclosure.
FIG. 1A illustrates a top-down view of an exemplary display
substrate according to the disclosed embodiments;
FIG. 1B illustrates an enlarged view of the area A in FIG. 1A;
FIG. 2 illustrates a schematic view of an exemplary pair of
pressure signal output lines according to the disclosed
embodiments;
FIG. 3 illustrates a schematic view of another exemplary pair of
pressure signal output lines according to the disclosed
embodiments;
FIG. 4A illustrates a schematic view of another exemplary pair of
pressure signal output lines according to the disclosed
embodiments;
FIG. 4B illustrates a schematic view of another exemplary pair of
pressure signal output lines according to the disclosed
embodiments;
FIG. 5 illustrates a top-down view of another exemplary display
substrate according to the disclosed embodiments;
FIG. 6A illustrates a top-down view of another exemplary display
substrate according to the disclosed embodiments;
FIG. 6B illustrates a top-down view of another exemplary display
substrate according to the disclosed embodiments;
FIG. 7 illustrates a top-down view of another exemplary display
substrate according to the disclosed embodiments;
FIG. 8A illustrates a cross-sectional view of an exemplary display
substrate according to the disclosed embodiments;
FIG. 8B illustrates a cross-sectional view of another exemplary
display substrate according to the disclosed embodiments;
FIG. 8C illustrates a cross-sectional view of another exemplary
display substrate according to the disclosed embodiments;
FIG. 9A illustrates a cross-sectional view of an exemplary crossing
of first connecting section and second connecting section according
to the disclosed embodiments;
FIG. 9B illustrates a cross-sectional view of another exemplary
crossing of first connecting section and second connecting section
according to the disclosed embodiments;
FIG. 10A illustrates an equivalent circuit diagram of an exemplary
bridge type pressure sensor according to the disclosed
embodiments;
FIG. 10B illustrates a schematic diagram of an exemplary layout of
pressure sensor according to the disclosed embodiments;
FIG. 10C illustrates a schematic view of an exemplary semiconductor
pressure sensor according to the disclosed embodiments;
FIG. 11A illustrates a cross-sectional view of an exemplary display
panel according to the disclosed embodiments; and
FIG. 11B illustrates a cross-sectional view of another exemplary
display panel according to the disclosed embodiments.
DETAILED DESCRIPTION
Reference will now be made in detail to exemplary embodiments of
the disclosure, which are illustrated in the accompanying drawings.
Wherever possible, the same reference numbers will be used
throughout the drawings to refer to the same or like parts. It
should be understood that the exemplary embodiments described
herein are only intended to illustrate and explain the present
invention and not to limit the present invention. In addition, it
should also be noted that, for ease of description, only part, but
not all, of the structures associated with the present invention
are shown in the accompanying drawings. Other embodiments obtained
by those skilled in the art without making creative work are within
the scope of the present invention.
FIG. 1A illustrates a top-down view of an exemplary display
substrate according to the present disclosure. FIG. 1B illustrates
an enlarged view of the area A in FIG. 1A. As shown in FIGS. 1A and
1B, the display substrate 100 may include a display region R1 and a
non-display region R2 surrounding the display region R1. At least
one display signal line 210 and at least one pressure sensor 211
may be configured in the non-display region R2 of the display
substrate 100.
Each pressure sensor 211 may be configured with two pressure signal
output terminals Vout1 and Vout2, and a first pressure signal
output line m and a second pressure signal output line n
corresponding to each pressure sensor 211. The first pressure
signal output line m and the second pressure signal output line n
may be electrically connected to the two pressure signal output
terminals Vout1 and Vout2 of the pressure sensor 211,
respectively.
The first pressure signal output line m may include at least one
first line section m1 and at least one second line section m2. The
first line section m1 and the second line section m2 may be
electrically connected by a first connecting section x. The second
pressure signal output line n may include at least one third line
section n1 and at least one fourth line section n2. The third line
section n1 and the fourth line section n2 may be electrically
connected by a second connecting section y. The first line section
m1, the second line section m2, the third line section n1, and the
fourth line section n2 may be configured in parallel with the
display signal line 210. The first line section m1 and the third
line section n1 may have an equal first distance d1 to the display
signal line 210. The second line section m2 and the fourth line
section n2 may have an equal second distance d2 to the display
signal line 210. The first distance d1 may be greater than the
second distance d2.
Specifically, referring to FIGS. 1A and 1B, the display substrate
100 may include a display region R1 and a non-display region R2
surrounding the non-display region R1. Display signal lines 210 are
often configured in the non-display region R2 of the display
substrate 100. For the display substrate 100 having a pressure
detection function, in addition to the display signal lines 210, at
least one pressure sensor 211 may be configured in the non-display
region R2. The pressure sensor 211 may have two pressure signal
output terminals Vout1 and Vout2.
When a finger or a stylus, etc., is pressed against the display
device, the display substrate 100 may deform. A pressure sensor 211
configured in a corresponding position may detect the deformation,
and produce a pressure sensing signal accordingly. The pressure
sensing signal may be output by the pressure sensor 211 through the
two pressure signal output terminals Vout1 and Vout2. Specifically,
the pressure sensing signal output by the two pressure signal
output terminals Vout1 and Vout2 may be sent to a driver chip
through the first pressure signal output line m and the second
pressure signal output line n. The driver chip may calculate the
pressure based on the two pressure sensing signals.
As shown in FIG. 1B, the first pressure sensing signal Vout1 output
by the first pressure signal output terminal Vout1 of the pressure
sensor 211 may be carried by the first pressure signal output line
m. The second pressure sensing signal Vout2 output by the second
pressure signal output terminal Vout2 of the pressure sensor 211
may be carried by the second pressure signal output line n.
However, in the signal line layout of the display substrate 100,
because a first coupling noise N1 occurs between the first pressure
signal output line m and the display signal line 210, and a second
coupling noise N2 occurs between the second pressure signal output
line n and the display signal line 210, the pressure sensing signal
difference V between the first pressure signal output line m and
the second pressure signal output line n may be calculated by the
following equation: V=Vout1+N1-(Vout2+N2).
When N1 and N2 are not equal, the pressure sensing signal actually
received by the driver chip from the pressure sensor 211 may be
distorted, and the pressure calculated by the driver chip may be
incorrect.
In one embodiment, in the non-display region R2 of the display
substrate 100, the first line section m1 and the second line
section m2 of the first pressure signal output line m, and the
third line section n1 and the fourth line section n2 of the second
pressure signal output line n may be configured in parallel with
the display signal line 210. The first line section m1 and the
third line section n1 may have an equal distance to the display
signal line 210. The second line section m2 and the fourth line
section n2 may have an equal distance to the display signal line
210. In this case, a coupling noise occurred between the first line
section m1 and the display signal line 210 may be N11. A coupling
noise occurred between the second line section m2 and the display
signal line 210 may be N12. A coupling noise occurred between the
third line section n1 and the display signal line 210 may be N21. A
coupling noise occurred between the fourth line section n2 and the
display signal line 210 may be N22. The pressure signal difference
V' between the first pressure signal output line m and the second
pressure signal output line n may be calculated by the following
equation: V'=Vout1+N11+N12-(Vout2+N21+N22).
With respect to the pressure signal output lines, the coupling
noises appearing on the first line section m1, the second line
section m2, the third line section n1, and the fourth line section
n2, which are parallel with the display signal line 210, may be
dominant. Thus, the coupling noises between the first line section
m1 and the second line section m2 of the first pressure signal
output line m and the paralleled display signal line 210 and
between the third line section n1 and the fourth line section n2 of
the second pressure signal output line n and the paralleled display
signal 210 may be primarily considered. That is, the pressure
signal difference V' between the first pressure signal output line
m and the second pressure signal output line n may be obtained by
only considering the coupling noises appearing on the first line
section m1, the second line section m2, the third line section n1,
and the fourth line section n2, which are parallel to the display
signal line 210.
Because the first line section m1 and the third line section n1
have an equal first distance d1 to the display signal line 210, and
the second line section m2 and the fourth line section n2 have an
equal second distance d2 to the display signal line 210, the
coupling noises N11 and N21 may be similar, and the coupling noises
N12 and N22 may be similar too. As a result, the pressure sensing
signal difference Tr actually received by the driver chip may be
substantially close or almost equal to the actual difference
between the Vout1 and Vout2 output by the pressure sensor. Thus,
the precision of pressure measurement may be improved.
It should be noted that only one pressure sensor 211 and one
display signal line 210 are shown on each of the two sides of the
display region in FIGS. 1A and 1B. In real life scenarios, a
plurality of pressure sensors 211 and a plurality of display signal
lines 210 may be configured on both sides or all four sides of the
display region R1. When the plurality of pressure sensors 211 are
configured, the first pressure signal output line m and the second
pressure signal output line n corresponding to each pressure sensor
211 may satisfy the above condition. When the plurality of display
signal lines 210 are configured, because each display signal line
is parallel with each other, the above condition may be satisfied
between the first line section m1, the second line section m2, the
third line section n1, the fourth line section n2, and any one of
the display signal lines 210.
In addition, in certain embodiments, the number of line sections
such as the first line section m1 and the second line section m2 on
the first pressure signal output line m and the number of line
sections such as the third line section n1 and the fourth line
section on the second pressure signal output line n are not limited
by the present disclosure.
FIG. 2 illustrates a schematic view of an exemplary pair of
pressure signal output lines according to the present disclosure.
As shown in FIG. 2, a total length of the first line sections m1 on
the first pressure signal output line m may be equal to a total
length of the third line sections n1 on the second pressure signal
output line n, and a total length of the second line sections m2 on
the first pressure signal output line m may be equal to a total
length of the fourth line sections n2 on the second pressure signal
output line n.
Specifically, a unit length of any pressure signal output line that
has an equal distance to the display signal line may be subject to
a same level of coupling noise. Referring to FIG. 2, the two output
terminals Vout1 and Vout2 of the pressure sensor 211 in the display
substrate 100 may be connected to the first line section m1 having
a length of Lm1 and the second line section m2 having a length of
Lm2 of the first pressure signal output line m, and the third line
section n1 having a length of Ln1 and the fourth line section n2
having a length of Ln2 of the second pressure signal output line n,
respectively.
For example, N1 may be a coupling noise for a unit length of the
first line section m1 and the third line section n1, both of which
have a first distance d1 to the display signal line 210, and N2 may
be a coupling noise for a unit length of the second line section m2
and the fourth line section n2, both of which have a second
distance d2 to the display signal line 210. When the first pressure
signal output line m includes a number of first line sections m1
and b number of second line sections m2, and the second pressure
signal output line n includes c number of third line sections n1
and d number of fourth line sections n2, the coupling noises of the
first line sections m1, the second line sections m1, the third line
sections n1, and the fourth line sections n2 with respect to the
display signal line 210 may be Nm1, Nm2, Nn1, and Nn2, as shown in
the equations below: Nm1=a.times.Lm1.times.N1,
Nm2=b.times.Lm2.times.N2, Nn1=c.times.Ln1.times.N1,
Nn2=d.times.Ln2.times.N2.
It can be seen that when the total length a.times.Lm1 of the first
line sections m1 and the total length c.times.Ln1 of the third line
sections n1 are equal, the coupling noise Nm1 of the first line
sections m1 and the coupling noise Nn1 of the third line sections
n1 may be equal. Similarly, when the total length b.times.Lm2 of
the second line sections m2 and the total length d.times.Ln2 of the
fourth line sections n2 are equal, the coupling noise Nm2 of the
second line sections m2 and the coupling noise Nn2 of the fourth
line sections n2 may be equal. In this case, the pressure signal
difference V' between the first pressure signal output line m and
the second pressure signal output line n which carry the signals
from the two output terminals of the pressure sensor 211 may be:
V'=Vout1+Nm1+Nm2-(Vout2+Nn1+Nn2)=Vout1-Vout2.
With respect to the pressure signal output lines, the coupling
noises appearing on the first line section m1, the second line
section m2, the third line section n1, and the fourth line section
n2, which are parallel with the display signal line 210, may be
dominant. Thus, the coupling noises between the first line section
m1 and the second line section m2 of the first pressure signal
output line m and the paralleled display signal line 210 and
between the third line section n1 and the fourth line section n2 of
the second pressure signal output line n and the paralleled display
signal 210 may be primarily considered. That is, the pressure
signal difference V' between the first pressure signal output line
m and the second pressure signal output line n which carry the
signals from the two output terminals of the pressure sensor 211
may be obtained by only considering the coupling noises appearing
on the first line section m1, the second line section m2, the third
line section n1, and the fourth line section n2, which are parallel
to the display signal line 210.
Thus, making the total length of the first line sections m1 on the
first pressure signal output line m equal to the total length of
the third line sections n1 on the second pressure signal output
line n, and making the total length of the second line sections m2
on the first pressure signal output line m equal to the total
length of the fourth line sections n2 on the second pressure signal
output line n may, to certain degree, mitigate the distortion
caused by different coupling noises appearing on the two pressure
signal output lines with respect to the display signal line 210,
and may more precisely calculate the pressure measurement.
In one embodiment, referring to FIG. 2, the first pressure signal
output line m may have a first number of first line sections m1 and
a first number of second line sections m2. The second pressure
signal output line n may have a second number of third line
sections n1 and a second number of fourth line sections n2. The
first number may be equal to the second number. That is, the number
of first line sections m1, the number of second line sections m2,
the number of third line sections n1, and the number of fourth line
sections n2 may be equal. Thus, the first pressure signal output
line m and the second pressure signal output line n may have an
almost symmetrical structure, and may reduce the complexity of the
fabrication process.
FIG. 3 illustrates a schematic view of another exemplary pair of
pressure signal output lines according to the present disclosure.
In one embodiment, the lengths of the first line section m1, the
second line section m2, the third line section n1, and the fourth
line section n2 may be equal. That is: L=Lm1=Lm2=Ln1=Ln2.
In addition, the numbers of the first line section m1, the second
line sections m2, the third line sections n1, and the fourth line
sections n2 may be equal. Making the coupling noises appearing on
the first pressure signal output line m and the second pressure
signal output line n equal with respect to the display signal line
210 may be easier to achieve in the present disclosure.
In addition, in the certain embodiments, the only scenarios
considered may be coupling noises appearing on the first line
sections m1 and the second line sections m2 of the first pressure
signal output line m and the third line sections n1 and the fourth
line sections n2 of the second pressure signal output line n, all
of which are parallel to the display signal line 210. However, the
first connecting sections x and the second connecting sections y
may cause inconsistent or different coupling noises on the first
pressure signal output line m and the second pressure signal output
line n.
Specifically, to solve the problem, referring to the examples in
FIG. 1B, FIG. 2, and FIG. 3, the first connecting sections x and
the second connecting sections y may be paired and crossed with
each other, and arranged alternately. The following two methods for
mitigating the inconsistent or different coupling noises on the two
pressure signal output lines with respect to the display signal
line caused by the first connecting sections x and the second
connecting sections y are discussed.
In the first method, the lengths of the first connecting sections x
and the second connecting sections y may be configured to be
substantially shorter than the pressure signal output lines so that
the coupling noise contributions by the connecting sections may be
negligible. In one embodiment, the ratio of a total length of the
first connecting sections x over the length of the first pressure
signal output line m may be less than 1:10, and the ratio of a
total length of the second connecting sections y over the length of
the second pressure signal output linen may be less than 1:10.
The total length of the first pressure signal output line m may
include the length of all first line sections m1, the length of all
second line sections m2, and the length of all first connecting
sections x. Similarly, the total length of the second pressure
signal output line n may include the length of all third line
sections n1, the length of all fourth line sections n2, and the
length of all second connecting sections y. In this case, the ratio
of the total length of all first connecting sections x over the
length of the first pressure signal output line m may be less than
1:10, and the ratio of the total length of all second connecting
sections y over the length of the second pressure signal output
line n may be less than 1:10. That is, the total length of all
first connecting sections x and all second connecting sections y
may be kept as short as possible so that the coupling noise
inconsistency or difference caused by the first connecting sections
x and the second connecting sections y may be negligible.
FIG. 4A illustrates a schematic view of another exemplary pair of
pressure signal output lines according to the present disclosure.
FIG. 4B illustrates a schematic view of another exemplary pair of
pressure signal output lines according to the present disclosure.
In the second method, referring to FIG. 4A and FIG. 4B, the
orthogonal projection of the first connecting section x on the
extension direction of the display signal line 210 may have a
section length Lx, the orthogonal projection of the corresponding
second connecting section y on the extension direction of the
display signal line 210 may have a section length Ly, and
Lx=Ly.
Specifically, as shown in FIG. 4A, the first pressure signal output
line m may include a first line section m1 having a length Lm1, and
a second line section m2 having a length Lm2. The second pressure
signal output line n may include a third line section n1 having a
length Ln1, and a fourth line section n2 having a length Ln2. The
first connecting section x which connects the first line section m1
and the second line section m2 may have a length Lx orthogonally
projected on the extension direction of the display signal line
210, and the second connecting section y which connects the third
line section n1 and the fourth line section n2 may have a length Ly
orthogonally projected on the extension direction of the display
signal line 210.
The length Lm1 of the first line section m1 and the length Ln2 of
the fourth line section n2 may not be equal. The length Lm2 of the
second line section m2 and the length Ln1 of the third line section
n2 may not be equal. The length Lx of the first connecting section
x orthogonally projected on the display signal line 210 may be made
equal to the length Ly of the second connecting section y
orthogonally projected on the display signal line 210 by wiring
layout, that is: L'=Lx=Ly.
In addition, as shown in FIG. 4B, when the length of the first line
section m1 is equal to the length of the fourth line section n2,
and the length of the second line section m2 is equal to the length
of the third line section n1, the length Lx of the first connecting
section x orthogonally projected on the display signal line 210 may
be equal to the length Ly of the second connecting section y
orthogonally projected on the display signal line 210. Thus, the
coupling noise between the first connecting section x and the
display signal line 210 may be equal to the coupling noise between
the second connecting section y and the display signal line
210.
In this case, when the total length of the first line sections m1
of the first pressure signal output line m is equal to the total
length of the third line sections n1 of the second pressure signal
output line n, and the total length of the second line sections m2
of the first pressure signal output line m is equal to the total
length of the fourth line sections n2 of the second pressure signal
output line n, the distortion caused by the coupling noises between
the first pressure signal output line m and the display signal line
210 and between the second pressure signal output line n and the
display signal line 210 may be mitigated.
In one embodiment, referring to FIG. 2, the first pressure signal
output line m may include a plurality of first line sections m1 and
a plurality of second line sections m2, and the second pressure
signal output line n may include a plurality of third line sections
n1 and a plurality of fourth line sections n2. As long as the
conditions expressed in the equations are satisfied, the numbers of
the first line sections m1, the second line sections m2, the third
line sections n1, and the fourth line sections n2 are not limited
by the present disclosure.
FIG. 5 illustrates a top-down view of another exemplary display
substrate according to the present disclosure. As shown in FIG. 5,
a driver chip 212 may be configured in the non-display region R2 of
the display substrate 100. The first pressure signal output line m
and the second pressure signal output line n may be electrically
connected to the driver chip 212.
Specifically, referring to FIG. 5, the driver chip 212 configured
in the non-display region R2 of the display substrate 100 may be
electrically connected to the first pressure signal output line m
and the second pressure signal output line n to detect the pressure
sensing signals output by the pressure signal output terminals of
the pressure sensor 211. The driver chip 212 may also be
electrically connected to the display signal 210. The driver chip
212 may be a common driver chip providing both the display function
and the pressure detection function such that one driver chip may
be eliminated in the configuration and the fabrication cost of the
display substrate 100 may be reduced.
FIG. 6A illustrates a top-down view of another exemplary display
substrate according to the present disclosure. As shown in FIG. 6A,
each pressure sensor 211 may be independently connected to a
separate first pressure signal output line m and a separate second
pressure signal output line n.
FIG. 6B illustrates a top-down view of another exemplary display
substrate according to the present disclosure. As shown in FIG. 6B,
alternatively, the pressure sensor 211 that is far away from the
driver chip 212 may share a portion of the first pressure signal
output line m with the pressure sensor 211 that is close to the
driver chip 212, and the pressure sensor 211 that is far away from
the driver chip 212 may share a portion of the second pressure
signal output line n with the pressure sensor 211 that is close to
the driver chip 212.
Specifically, as shown in FIG. 6A, because the pressure sensors 211
located on s same side of the display region R1 are independently
connected to separate first pressure signal output line m and
separate second pressure signal output line n, each pressure sensor
211 may separately output the pressure sensing signals, which are
carried to the driver chip 212 by the separate first pressure
signal output line m and the separate second pressure signal output
line n. Thus, the each pressure sensor 211 may operate
independently or simultaneously.
Alternatively, the pressure sensors located on a side of the
display region R1 may operate in a time-division mode. As shown in
FIG. 6B, the pressure sensors 211 located on the same side of the
display region may partially share one first pressure signal output
line m and one second pressure signal output line n. In this case,
the pressure sensor 211 that is far away from the driver chip 212
may share a portion of the first pressure signal output line m and
a portion of the second pressure signal output line n with the
pressure sensor 211 that is close to the driver chip 212. Thus,
only two pressure signal output lines may be configured for a
plurality of pressure sensors 211 located on a same side of the
display region. To a large extent, the number of pressure signal
output lines may be reduced, fabrication process complexity may be
reduced, and bezels may be narrowed, making narrow bezel design
achievable.
In certain embodiments, switches may be configured on the pressure
signal output lines of each pressure sensor 211. By controlling the
switches, pressure sensors 211 may operate in a time-division
mode.
In one embodiment, the display signal 210 may include at least one
of a clock signal line, an inverted clock signal line, and a
trigger signal line. Thus, the display requirement for the pixels
in the display region R1 of the display substrate 100 may be
satisfied.
FIG. 7 illustrates a top-down view of another exemplary display
substrate according to the present disclosure. As shown in FIG. 7,
cascaded shift registers 220 may be configured in the non-display
region R2 of the display substrate 100. The display signal line 210
may be electrically connected to the cascaded shift registers 220.
Each shift register 220 may be used to provide a scanning signal to
a scanning line in the display region R1. Each pressure sensor 211
may be configured between two adjacent shift registers. Thus, the
pressure sensors 211 may not occupy additional bezel area in the
non-display region R2 of the display substrate 100, and may achieve
the narrow bezel design of the display substrate 100.
FIG. 8A illustrates a cross-sectional view of an exemplary display
substrate according to the present disclosure. As shown in FIG. 8A,
a first line section m1 and a second line section m2 of a first
pressure signal output line m, a third line section n1 and a fourth
line section n2 of a second pressure signal output line n, and the
display signal line 210 may be disposed in a first metal layer.
Because the four line sections and the display signal line 210 are
located in the non-display region R2, and are paralleled with each
other, configuring the four line sections and the display signal
line 210 in a same metal layer may simplify the fabrication
process.
In one embodiment, the display substrate 100 may also include data
lines, scanning lines, and pixel capacitors located in the display
region R1. First electrodes and second electrodes of the data
lines, the scanning lines, and the pixel capacitors in the display
region R1 may be made of metal or metal oxide. Thus, the first
metal layer may also include the data lines. As shown in FIG. 8A,
the first line section m1, the second line section m2, the third
line section n1, the fourth line section n2, and a data line 301
are coplanar with each other.
The first metal layer may also include scanning lines. FIG. 8B
illustrates a cross-sectional view of another exemplary display
substrate according to the present disclosure. As shown in FIG. 8B,
the first line section m1, the second line section m2, the third
line section n1, the fourth line section n2, and a scanning line
302 are coplanar with each other.
The first metal layer may also include first electrodes and second
electrodes of pixel capacitors. FIG. 8C illustrates a
cross-sectional view of another exemplary display substrate
according to the present disclosure. As shown in FIG. 8C, the first
line section m1, the second line section m2, the third line section
n1, the fourth line section n2, and an electrode of a pixel
capacitor 303 are coplanar with each other. The first electrode and
the second electrode may be pixel electrode and common
electrode.
In certain embodiments, the first line sections m1, the second line
sections m2, the third line sections n1, the fourth line sections
n2, and the existing structures in the display region R1 may be
coplanar with each other, and may be formed in a same step of the
fabrication process, thus effectively simplifying the fabrication
process.
FIG. 9A illustrates a cross-sectional view of an exemplary crossing
of first connecting section and second connecting section according
to the present disclosure. As shown in FIG. 9A, a first connecting
section x of a first pressure signal output line m may be disposed
in a first metal layer. A second connecting section y of a second
pressure signal output line n may include at least a bridge portion
y1 disposed in a second metal layer. Specifically, as shown in FIG.
9A, the second connecting section y of the second pressure signal
output line n may also include a y2 portion and a y3 portion, which
are disposed on both sides of the bridge portion y1 and are
coplanar with the first connecting section x. The bridge portion y1
may be connected to the portion y2 and the portion y3 through the
through-holes formed in an insulation layer.
FIG. 9A illustrates a cross-sectional view of another exemplary
crossing of first connecting section and second connecting section
according to the present disclosure. In one embodiment, as shown in
FIG. 9A, the bridge portion y1 is disposed above the first
connecting section x. In another embodiment, as shown in FIG. 9B,
the first connecting section x may be disposed above the bridge
portion y1.
In certain embodiments, the pressure sensor may be a bridge type
pressure sensor or a semiconductor pressure sensor. For both types
of pressure sensors, two bias voltage input terminals may be
configured. Accordingly, a first bias voltage input line and a
second bias voltage input line may be configured in the non-display
region of the display substrate, and may be electrically connected
to the two bias voltage input terminals of the corresponding
pressure sensor.
FIG. 10A illustrates an equivalent circuit diagram of an exemplary
bridge type pressure sensor according to the present disclosure. As
shown in FIG. 10A, the pressure sensor may be a Wheatstone bridge
type pressure sensor. Accordingly, the pressure sensor may include
a first sensing resistor R1, a second sensing resistor R2, a third
sensing resistor R3, and a fourth sensing resistor R4. A first end
of the first sensing resistor R1 may be electrically connected to a
first bias voltage input terminal Vin1, and a second end of the
first sensing resistor R1 may be electrically connected to a first
pressure signal output terminal Vout1. A first end of the second
sensing resistor R2 may be electrically connected to a second bias
voltage input terminal Vin2, and a second end of the second sensing
resistor R2 may be electrically connected to a first pressure
signal output terminal Vout1. A first end of the third sensing
resistor R3 may be electrically connected to a second bias voltage
input terminal Vin2, and a second end of the third sensing resistor
R3 may be electrically connected to a second pressure signal output
terminal Vout2. A first end of the fourth sensing resistor R4 may
be electrically connected to a first bias voltage input terminal
Vin1, and a second end of the fourth sensing resistor R4 may be
electrically connected to a second pressure signal output terminal
Vout2.
In the Wheatstone bridge type pressure sensor, the first sensing
resistor R1, the second sensing resistor R2, the third sensing
resistor R3, and the fourth sensing resistor R4 may be made of
metallic material, or semiconductor material. The semiconductor
material may be a polysilicon material film or an amorphous silicon
material film.
In addition, the sensing resistors of the Wheatstone bridge type
sensor may extend in different directions such that each sensing
resistor may be subject to different resistance changes in
different directions. Referring to FIG. 10A, two directions that
are perpendicular to each other on the display substrate may be
defined as a first extension direction x and a second extension
direction y. Accordingly, the extension length from the first end
to the second end of the first sensing resistor R1 may have a
component on the first extension direction x greater than a
component on the second extension direction y. The extension length
from the first end to the second end of the second sensing resistor
R2 may have a component on the second extension direction y greater
than a component on the first extension direction x. The extension
length from the first end to the second end of the third sensing
resistor R3 may have a component on the first extension direction x
greater than a component on the second extension direction y. The
extension length from the first end to the second end of the fourth
sensing resistor R4 may have a component on the second extension
direction y greater than a component on the first extension
direction x.
Thus, the first sensing resistor R1 and the third sensing resistor
R3 on the display substrate may sense any deformation in the first
extension direction x, and the second sensing resistor R2 and the
fourth sensing resistor R4 on the display substrate may sense any
deformation in the second extension direction y.
Generally, when the resistor bridge is balanced, a resistor
relationship equation
.times..times..times..times..times..times..times..times.
##EQU00001## may be satisfied. According to the sensing resistor
configuration, when a deformation occurs in the extension direction
x, resistance of the first sensing resistor R1 and the third
sensing resistor R3 may substantially change. According to the
resistor relationship equation, when the resistance of one or both
of the first sensing resistor R1 and the third sensing resistor R3
increases, the resistor relationship equation may no longer hold.
Alternatively, when the resistance of one or both of the first
sensing resistor R1 and the third sensing resistor R3 decreases,
the resistor relationship equation may not hold either.
According to the sensing resistor configuration, when a deformation
occurs in the extension direction y, resistance of the second
sensing resistor R2 and the fourth sensing resistor R4 may
substantially change. According to the resistor relationship
equation, when the resistance of one or both of the second sensing
resistor R2 and the fourth sensing resistor R4 increases, the
resistor relationship equation may no longer hold. Alternatively,
when the resistance of one or both of the second sensing resistor
R2 and the fourth sensing resistor R4 decreases, the resistor
relationship equation may not hold either. The above resistor
configuration may improve the sensitivity of the pressure
sensor.
In one embodiment, the first sensing resistor R1, the second
sensing resistor R2, the third sensing resistor R3, and the fourth
sensing resistor R4 of the bridge type pressure sensor may be
configured in a folded line shape. FIG. 10B illustrates a schematic
diagram of an exemplary layout of pressure sensor according to the
present disclosure. Referring to FIG. 10B, the first sensing
resistor R1, the second sensing resistor R2, the third sensing
resistor R3, and the fourth sensing resistor R4 in the folded line
shape may be sequentially connected, and may be electrically
connected to the first bias voltage input terminal Vin1, the first
pressure signal output terminal Vout1, the second bias voltage
input terminal Vin2, and the second pressure signal output terminal
Vout2, respectively in the pressure sensor.
The sensing resistors in the folded line shape may be convenient
for configuring different sensing resistors in different extension
directions. In addition, the sensing resistors in the folded line
shape may be electrically connected head to tail or vice versa such
that the sensing resistors may be close to each other to eliminate
the effect caused by the temperature differences of different
sensing resistors.
FIG. 10C illustrates a schematic view of an exemplary semiconductor
pressure sensor according to the present disclosure. As shown in
FIG. 10C, the semiconductor pressure sensor may be in a
quadrilateral shape. The first bias voltage input terminal Vin1 and
the second bias voltage input terminal Vin2 may be configured on
two opposing sides of the quadrilateral, and the first pressure
signal output terminal Vout1 and the second pressure signal output
terminal Vout2 may be configured on the other two sides of the
quadrilateral. The semiconductor pressure sensor may be made of a
polysilicon material film or an amorphous silicon material film.
The semiconductor pressure sensor may have advantages of small
footprint and high pressure sensitivity.
FIG. 11A illustrates a cross-sectional view of an exemplary display
panel according to the present disclosure. As shown in FIG. 11A,
the display panel may include a display substrate 100 disclosed in
the present disclosure. The display panel may be used in any
display devices such as smart phone, computer, television set,
smart watch, and information inquiry machine installed in the
public area. As shown in FIG. 11A, the display panel may be a
liquid crystal display panel. The display substrate 100 may be an
array substrate of the liquid crystal display panel. In addition,
the display panel may also include a color film substrate 200, and
a liquid crystal layer 300 sandwiched between the arrays substrate
100 and the color film substrate 200.
FIG. 11B illustrates a cross-sectional view of another exemplary
display panel according to the present disclosure. As shown in FIG.
11B, the display panel may be an organic light emitting display
panel. The display substrate 100 may be an array substrate. In
addition, the display panel may also include a cover 400 disposed
above the array substrate.
The display panel according to the present disclosure divides the
first pressure signal output line and the second pressure signal
output line into a plurality of line sections, which have different
distances to the display signal line. Each pressure signal output
line includes a plurality of line sections. The coupling noises
appearing on different pressure signal output lines are equalized
to improve the precision of the pressure measurement.
Various embodiments have been described to illustrate the operation
principles and exemplary implementations. It should be understood
by those skilled in the art that the present invention is not
limited to the specific embodiments described herein and that
various other obvious changes, rearrangements, and substitutions
will occur to those skilled in the art without departing from the
scope of the invention. Thus, while the present invention has been
described in detail with reference to the above described
embodiments, the present invention is not limited to the above
described embodiments, but may be embodied in other equivalent
forms without departing from the scope of the present invention,
which is determined by the appended claims.
* * * * *